A rhizomatous perennial herb of saline habitats. It is abundant in coastal and estuarine saltmarshes, flushed coastal rocks and cliff edges subject to sea spray, and the banks of tidal rivers. Inland, it occurs in brackish pastures as, for example, over saline Keuper beds in Cheshire, and at one site in Hampshire, in flushed turf on calcareous clay. Very rarely, it grows alongside salt-treated roads. Lowland.
This species shows no appreciable change to its coastal range since the 1962 Atlas but has been lost from some of its few inland sites through habitat destruction.
Circumpolar Boreo-temperate element.
Light (Ellenberg): 8
Moisture (Ellenberg): 7
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 4
January Mean Temperature (Celsius): 4.2
July Mean Temperature (Celsius): 14.3
Annual Precipitation (mm): 1181
Height (cm): 55
Perennation - primary
Life Form - primary
Clonality - primary
Comment on Clonality
Count of 10km squares in Great Britain: 837
Count of 10km squares in Ireland: 251
Count of 10km squares in the Channel Isles: 5
Atlas Change Index: -0.44
Weighted Changed Factor: -3
Weighted Change Factor Confidence (90%)
Atlas text references
1991. Biological Flora of the British Isles. No. 172. Triglochin maritima L. Journal of Ecology. 79:531-555.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
1977. The vegetation of British inland salt marshes. Journal of Ecology. 65:673-698.